For successful crooks and corrupt foreign officials, Britain has long been a popular place to stash dodgy cash. Investing a few million pounds in a house in a discreet London neighbourhood is a neat way to hide stolen money. But Britain is getting tougher on such ruses. The government hopes that “unexplained-wealth orders”, part of the Criminal Finances Act 2017, which came into effect on September 30th, makes it easier to seize the loot of crooked bureaucrats and con artists.